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Evidence for Catalyst Association in the Catalyst Transfer Polymerization of Thieno[3,2-b]thiophene

12-12-2014 | Pieter Willot; Guy Koeckelberghs, Macromolecules, 2014

The performance of catalyst transfer polymerization (CTP) reactions which depend on catalyst association was studied on 3,6-dioctylthiothieno[3,2-b]thiophene (TT)-monomers. This monomer was selected because a strong association of the catalyst is expected, since the aromaticity of thienothiophene ...

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Homoleptic Tris(α,ω-alkanediyl)yttriates of the Type [{Li(dme)}3{Y(CH2-X-CH2)3}] (X = C2H4, C3H6, Si(CH3)2)

12-12-2014 | Reinald Fischer; Stefan Bode; Mathias Köhler; Jens Langer; Helmar Görls; Martin D. Hager; Ulrich S. Schubert; Matthi ..., Organometallics, 2014

The metathesis reaction of anhydrous yttrium(III) chloride with ethereal solutions of 1,4-dilithiobutane, 1,5-dilithiopentane as well as bis(lithiomethyl)dimethylsilane in the molar ratio of 1:3 yields the homoleptic yttriates [{Li(dme)}3{Y(C4H8)3}] (2), [{Li(dme)}3{Y(C5H10)3}] (3), and ...

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Hydration and Ordering of Lamellar Block Copolymer Films under Controlled Water Vapor

12-12-2014 | Yohei Kamata; Andrew J. Parnell; Philipp Gutfreund; Maximilian W. A. Skoda; Andrew J. C. Dennison; Robert Barker; Sh ..., Macromolecules, 2014

Amphiphilic block copolymers within a range of volume fraction spontaneously form vesicles in aqueous solution, where a water core is enclosed by a polymer bilayer. Thin-film rehydration is a method used to produce vesicles routinely; a thin film is immersed in water, the film swells, and ...

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Bis(N‐Confused Porphyrin) as a Semirigid Receptor with a Chirality Memory. A Two‐Way Host Enantiomerization through Point‐to‐Axial Chirality Transfer

11-12-2014 | Piotr J. Chmielewski, Marta Siczek, Marcin Stępień, Chemistry - A European Journal, 2014

Abstract The adduct formation of protonated bis(N‐confused porphyrin) (BNCP, 3,3′‐bis(meso‐tetratolyl‐2‐aza‐21‐carbaporphyrin) with chiral anions, carboxylic acids, and alcohols was studied in solution by means of 1H NMR and circular dichroism (CD) spectroscopic analysis and DFT methods. The ...

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Self‐Regulation Mechanism for Charged Point Defects in Hybrid Halide Perovskites

11-12-2014 | Aron Walsh, David O. Scanlon, Shiyou Chen, X. G. Gong, Su‐Huai Wei, Angewandte Chemie International Edition, 2014

Abstract Hybrid halide perovskites such as methylammonium lead iodide (CH3NH3PbI3) exhibit unusually low free‐carrier concentrations despite being processed at low‐temperatures from solution. We demonstrate, through quantum mechanical calculations, that an origin of this phenomenon is a ...

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Thickness, Composition, and Molecular Structure of Residual Thin Films Formed by Forced Dewetting of Ag from Glycerol/D2O Solutions

11-12-2014 | Jeanne E. Pemberton; Anoma Mudalige; Heemin Yoo, Langmuir, 2014

The thickness, composition, and interfacial molecular structure of residual thin films retained on the surface of polycrystalline Ag substrates after being forcibly dewet from glycerol/D2O solutions are investigated using contact angle measurements, ellipsometry, and polarization ...

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Elementary Steps of Iron Catalysis: Exploring the Links between Iron Alkyl and Iron Olefin Complexes for their Relevance in CH Activation and CC Bond Formation

10-12-2014 | Alicia Casitas, Helga Krause, Richard Goddard, Alois Fürstner, Angewandte Chemie International Edition, 2014

Abstract The alkylation of complexes 2 and 7 with Grignard reagents containing β‐hydrogen atoms is a process of considerable relevance for the understanding of C–H activation as well as C–C bond formation mediated by low‐valent iron species. Specifically, reaction of 2 with EtMgBr under an ...

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Coumarin based Gold(I)-Alkynyl Complex: A new class of Supramolecular Hydrogelator

10-12-2014 | Artur J Moro; Bertrand Rome; Elisabet Aguiló; Julià Arcau; Rakesh Puttreddy; Kari Rissanen; Joao Carlos Lima; Laura ..., Organic & Biomolecular Chemistry, 2014

A phosphine-gold(I)-alkynyl-coumarin complex, [Au{7-(prop-2-ine-1-yloxy)-1-benzopyran-2-one}(DAPTA)] (1), was synthesized and the formation of long luminescent fibers in solution was characterized via Fluorescence Microscopy and Dynamic Light Scattering. The fibers presented strong blue and green ...

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Shape-controlled synthesis of phosphor K2SiF6:Mn4+ nanorods and their luminescence properties

10-12-2014 | Xiaoqing Li; Xiangming Su; Ping Liu; Jie Liu; Zhiling Yao; Jiajun Chen; Hui Yao; Xibin Yu; Ming Zhan, CrystEngComm, 2014

A series of efficient red phosphor K2SiF6:Mn4+ nanoparticles with uniform morphology and dispersity were successfully prepared through a fast liquid–solid solution route at room temperature. Potassium oleate and SiO2 spheres/KMnO4 molar ratio play an important role in the formation of the nanorod ...

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A Bowl‐Shaped Circular Trinuclear Helicate Generated from a TiO4N2 Motif by a Multicomponent Self‐Assembly Approach

09-12-2014 | Pierre Mobian, Nathalie Baradel, Nathalie Kyritsakas, Georges Khalil, Marc Henry, Chemistry - A European Journal, 2014

Abstract The synthesis of a bowl‐shaped trinuclear circular titanium‐based helicate is reported. The strategy allowing access to this neutral architecture is based on a multicomponent self‐assembly approach in which the ligands involved in the process are a bis‐biphenol strand and 2,2′‐ ...

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